Combined expansion and contraction joint



y 1930- A. c. FISCHER COIBINED EXPANSION AND CONTRACTION JOINT Filed May 9, 1927 I 2 Z Z An. 4 1 W W% A.

Patented July 8, 1930 UNITED STATES PATENT oFF1c ALBEB/l C. FISCHER, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO THE PHILIP CAREY MANU- FAGTURING COMPANY, A CORP ORATION OF OHIO COMEBINED EXPANSION AND CONTRAOTION JOINT Application filed May 9,

This case contains subject-matter disclosed but not claimed in application Serial No. 526,742, which was filed January 3, 1922 and matured into Patent No. 1,655,835 on J anuary 10, 1928. l,

Heretofore in concrete pavements where contraction was to be provided for it has been the practice to insert a piece of metal longitudinally or transversely below the surface, so that when the concrete block or slab is poured and completed the contraction joint is not visible at the surface. After the concrete sets and contracts the function of these pieces of metal is to cause a very fine crevice to develop thru the entire slag, so that it becomes visible on the surface, and functioning in this way it is styled a contraction joint.

Further developments in this style of allowing for expansion and contraction in concrete pavements can be made in which an angularor tongue and groove formation is pro vided, so that the projections thus developing in one concrete slab, by reason" of filling in these projections in the contraction joint, penetrate the other slab so that resistance is caused to any lifting action on the part of the concrete slabs. Some of these formations have been angular and some half hexagonal in shape, with straight flanges extending on either side in a vertical position when the joint is installed. These contraction joints, while causing the crevice to develop along a straight line across the concrete slab or in the surface above which the joint --is.inserted, do not prevent the ingress of'water, street acids or the like, which would tend to hastily corrode the metal contraction joint, and also enter the subsoil underneath the slab, keeping the subsoil in a constantly wet or damp condition.

My invention -provides for an improved joint which has many advantages over the heretofore practiced methods, and also provides for the waterproofing of the joint automatically. These ad antages are realized by insertion of a bituminous slab of varying thickness, depending upon the requirements.

The contraction joint flanges are imbedded in the bituminous slab on either side of the projeetinigcenter. This not only tends to 1927. Serial No. 190,085.

preserve the metal flanges but also has a tendency to protect the projecting part of the joint, because in expanding in warm weather some of this bituminous material will ooze acting both as expansion and contraction" joints. v

Expansion joints have usually been placed so that the upper edge of the joint was visible on the surface of the pavement, and in many cases was allowed to project above the surface, so that the traffic would formasort of mushroom top over the crevice.

It can be readily understood that the purpose of this invention is to totally submerge both the contraction and expansion parts of this joint beneath the surface, so that when the concrete is finished and poured it will not be visible on the surface but will accomp lish the same function, in causing 'a crevice to form across the surface, due to contract-ion. It will further function by waterproofing this crevice from within, and upon expansion of the bituminous material, and also the pavement, it will cause the asphaltic substance to work its way up to the crevice, so that after a hot .period the bituminous material may often work its way to the surface, while the base part will have a tendency to prevent moisture from oozing up, filling the crevice from below, and in this manner the entire crevice will. be kept waterproof, and at the same time perform both the functions of an expansion joint and a contraction joint.

wise formed to develop the intermediate thickness of waterproofing material D. The

' and contraction of'the slabs coating or" layer D, as shown, following out the outline of the metal of the oint.

' A joint constructed in the manner described, owing to the waterproofing material D being of a compressible nature, will develop a medium for compensatin for expansion etween which the joint is installed, so as to keep the expansion j oint space filled at all times, regardless of contraction, and so that there will be no possibility of water seeping into the crevice. v I I If the joint is completely imbedded in the concrete and a crevice is developed in the concrete surface, as heretofore mentioned, upon expansion of the concrete the waterproofing material D will ooze into the crevice and waterproof the same. I.

The application of the waterproofing material D to the groove of the tongue and groove portionA will develop a cushion for the project-ion of the concrete slab which will materially aid functioning of the joint.

I claim:

1. A contraction joint for use in paving construction comprising a metallic body of preformed shape, provided with a relatively thin flange and a laterally extending interlocking portion for engaging the concrete sections, said metallic member carrying a coating of flowable waterproofing material covering one face surface. j

2. A contraction joint for use in paving construction consisting of a sheet metal strip bent laterally to provide an interlocking por tion to engage the concrete section s, said lateral bend providing a depression therein and said sheet metal strip carrying a coating of bituminous material lying in said depres sion and covering one face thereof, and said I material being constructed and arranged to flow when the contraction joint is subjected to heat and pressure from the concrete sections.

3. A contraction joint for use in paving I construction consisting of a strip of sheet xnetal bent intermediate its length to provide a longitudinal depression formed with angu- -larly shaped sides, tapering outwardly to meet two oppositely formed flanges lying in a common plane, that side of the sheet metal wherein the depression is .formed being coated over its entire surface with a flowable waterproofing'material.

4. A contraction joint adapted to cause a crevice to develop along a straight line across a concrete slab or in the surface above which the joint is inserted, said joint comprising a preformed strip of sheet metal having laterally extending flanges lying in a common plane, said flanges having adjacent inwardly flaring sides connected by a common side lying parallel to the flanged portion, one face of said strip being coated over its entire area with a flowable bituminous material.

5. A. combined expansion and contraction joint for use in a paving construction composed of concrete sections, comprising a sheet of metal having a laterally extending looking portion for engaging the concrete sections for the purpose indicated, said metal sheet providing an upwardly extending flange, one face of said sheet of metal being covered with a flowable waterproofing material.

6. A combined contraction and expansion joint as herein disclosed, consisting of a preformed strip of relatively thin sheet metal, covered on one face with a flowable, waterproofing material.

7. In a preformed expansion joint, a flexible strip having a tongue on one side, a corresponding groove on the opposite side, and a plastic layer attached to and covering one side of the strip.

8. In a preformed expansion joint, a metal strip having a tongue on one side, a corresponding groove on the opposite, and a flat portion arranged to one side of said tongue and groove and a waterproofing layer covering one face of the strip and conforming to the contour thereof.

9. In a preformed expansion joint a flexible strip embodying in its structure a surface covering of plastic material and having a tongue on one side, and a corresponding groove on the opposite side. j

Signed at Chicago, Illinois, this 3rd day 

